From the very brief research that I've done, the GABA receptors seem to inhibit various brain functions to consolidate memory. So improving the GABA receptors may improve memory and attention. But as I say, I've not done a lot of research.

I'm not going to be taking anything that crosses the blood-brain barrier until I'm sure my body is relatively mercury free, as I don't want more mercury transporting up there.

Thanks for the information though, this is a subject I'm very interested in.